How long can the supermarket monitoring L chart be saved at most?

The duration depends on several parameters:

1, how big is the hard disk?

The larger the hard disk, the longer the video will be saved.

2. Camera clarity

The higher the HD of the camera, the longer the storage time.

3. Number of cameras

The more cameras there are, the shorter the storage time will be when the hard disk capacity remains unchanged.

4. Video configuration code rate

In the setting of hard disk video recorder, there is a bit rate setting. If the code rate is large, the resolution will be high, and the hard disk space will definitely be large.

When installing surveillance cameras, you should pay attention to the following points.

1, location requirements: For surveillance cameras, the location is directly related to the imaging effect of the equipment. Therefore, many users regard the monitoring effect as the primary reference for monitoring the installation position of the camera. However, they overlooked a very important point: the surveillance camera is not omnipotent, and there are also their own requirements in the choice of installation location, and the angle is what we consider.

2. Installation angle: there are mainly two types: cylindrical and hemispherical. Among them, the cylinder type is more common, and it is universal indoors and outdoors; Hemisphere is generally used indoors, small in size and can be installed on the wall or ceiling. Direct light sources should be avoided, and it is best not to install them against the light. Try to choose outdoor special support, but the wind resistance coefficient is very different. 3. Installation height: The installation height of the surveillance camera should not be too low or too high, which is inconvenient for future maintenance. It is recommended to install it within three or four meters.

4. Electricity safety: The surveillance camera needs to be powered separately, and attention should be paid to safety when making high-voltage lines. A small waterproof case can be installed under the surveillance camera, and the power supply and connector can be placed in the waterproof case. And pay attention to lightning protection;

5. Lighting environment requirements: When using the surveillance camera at night, in order to avoid reflection and shadow, lighting equipment is usually needed, and infrared lighting can be used; If you want to monitor at night, you have to use IPC with good night vision effect. The night vision distance is mainly determined by the number of infrared lamps. Generally speaking, the night vision distance of a single lamp is 30 meters, and that of a double lamp is 50 meters.